American Hayden Sands had a brief aviation career in 1909-1910. He was present at the February 1910 Heliopolis meeting, but was for some reason not an official participant. One report told that he made flights in a plane marked with the letter S rather than a race number. I was not convinced, but some time ago a postcard photo of his S-marked Antoinette turned up at one of the auction sites. You can see it on the Heliopolis "Planes" page.